Lord Herbert wrote on Jan 12
th, 2018 at 12:08pm:
The number of divers who end up dead-in-the-water because of equipment failure, panic, disorientation, separation from group, left in the water, sharks, etc is on a roll-call at the end of each Australian summer.
You wouldn't see me down there if you paid me big money.
Lol. Yes - you do get that sort of stuff happening. But its a very low percentage. It's mostly 'inexperienced tourism divers' under care of 'sausage factory' Tourism operators that things go pear shaped. That's why I sometimes 'Solo' Dive. It teaches me to be self reliant (mindset,etc) - but the solo dive is always a more conservative dive than if I was with fellow Divers.
Don't worry about 'sharks' Herbie. That's why you carry a knife. So if a big shark comes along - you stab your buddy!

Proper training (official) and wisdom given by experienced divers (common sense) goes a long way.
Rebreathers can be gnarly - but if you stay on the ball with proper maintenance and operation, then all should be well.
It's usually 'freak' situations (the hand of God) or simple mistakes of neglection that cause accidents. Panic also makes a problem grow.
I know of a few divers that are 'gun-ho' or push the envelope and as always 'problems or stressful' situations arise. Adrenalin junkies don't help.
There are four (x4) forms or 'cultures' of Diving.
Commercial Diving: Highly paid 'work' Diving.
Free Diving: Physiology Diving, Spear Fishing (no scuba)
Technical Diving: expensive Exploration, Scientific diving
Recreational Diving: Cheaper basic Diving for fun and social
All four sometimes blend into one another to some extent.
I'm a Recreational Diver. My deepest is 69m on Air (under good conditions). I dive with divers who are both Recreational and Technical. I also 'Free-Dive', as do many Recreational & Technical Divers. Free-Diving is 'breath (Apnea) hold' diving. I can just do 20m deep for a breath. Even this takes a lot of training.